December 20, 1890

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Features

Subscribers, Attention!

New Patent Selling Trick

The Artificial Production of Rain

Opening of the New Pulitzer Building

Tunnel Railways in New York

An Improved Nut Lock

An Adjustable Stuffing Box

Boomer & Boschert's Presses

An Automatic Electrical Damper Regulator

A Hot Water Ventilating Heater

An Easily Operated Belt Tightener

Rail Rolling at the Krupp Works, Essen

A Machine to Sand Brick Moulds

An Improved Article for Plastering, Tiling, and Cement Work

An Improved Lumber Drier

Mr. Brush's Windmill Dynamo

A Pine Apple Grove in Florida

New Marine Signal

To the North Pole in a Balloon

The "Crystal" Water Filter

The Scientific American- December 20, 1890

Departments

Letters

Correspondence- December 20, 1890

Departments

Business and Personal- December 20, 1890

Notes & Queries- December 20, 1890

To Inventors- December 20, 1890

Index of Inventions- December 20, 1890

Recently Patented Inventions- December 20, 1890

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Digital Issue ?Read or download this issue’s articles online. *A printed copy of this issue is not included. $7.99

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